Overview
GOST 28848-90 Oversized washer is a fastener that looks like a flat disk with a smooth cylindrical hole in the middle, the diameter of which is slightly larger than the diameter of the metric product with which it is used. The difference between R and V versions is in the hole: R - cylindrical hole, V - square hole.
Fastening group of GOST 28848-90
Most often, washers of GOST 28848-90 are made of stainless steel and belong to the stainless fastener group.
Materials for the manufacture of washers of GOST 28848-90
GOST 28848-90 is produced in the following materials:
- Steel, which is additionally coated with zinc. Zinc (Plated) protects against corrosion if the fasteners are to be used in aggressive environments.
- Stainless steel A2 and A4. Allows the fasteners to be used at significant temperature changes and in aggressive and humid environments.
Scope of application of washers of GOST 28848-90
GOST 28848-90 is most often used in the installation of wooden structures, due to its ability to increase the clamping area. But it also finds its application in mechanical engineering and construction, where a strong bearing surface is required at the joint.
The enlarged flat washer of GOST 28848-90 is used for assembling wooden structures. The washer has a standard round shape, but is characterized by an increased diameter. Due to the large pressing area, the load on the surface of the product is reduced, and the connection is prevented from loosening due to wear of the hole.
